Borescope inspection is a highly effective technique for visually assessing the internal condition of rotating machines without requiring extensive disassembly. Using a specialised camera (borescope) inserted into suitable access points, this method allows for detailed visual examination of the stator winding end region and rotor ends without pulling the rotor. Defects identified during the on-line or offline testing can often be verified and further located and understood through this complementary technique.

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